Sirius Glass
Subscriber
+1
I've been carrying a Jiffy calculator ever since you've mentioned it, a while back. I printed mine on regular paper, glued the center part on a piece of discarded folder and plastified the whole thing with packing tape. Also, I've used orange and yellow markers on the different columns, it help my eyes.
As I have posted before, I have been using the Jiffy calculator since it was published in 1963 and the exposures have been good especially with slide film. The updated versions have an expanded selection.